Menstrual pain (dysmenorrhea) is one of the complaints experienced by adolescent girls and can interfere with daily activities and quality of life. Relaxation techniques are a nonpharmacological method believed to be able to reduce pain levels by reducing muscle tension and relieving stress. Purpose: This study aims to determine the effect of relaxation techniques on reducing the level of menstrual pain in adolescents. Methods: This study used a quasi-experimental design with pretest-posttest approach without a control group. Sample of 15 people who are adolescent girls experiencing dysmenorrhea and selected through purposive sampling technique. The intervention was given in the form of relaxation techniques for 5 days. The Data were analyzed using paired t-test with significance level p <0.05. Results: The mean pain level before the intervention was 6.80 ± 1.01 and decreased to 3.93 ± 1.28 after the intervention. The t-test results showed a value of t = 9.264 with p = 0.000 (p < 0.05), which means there is a significant difference between the pain levels before and after the intervention. Implications: The results of this study show that relaxation techniques are effective in reducing the level of menstrual pain in adolescents. This provides a non-pharmacological alternative used by health workers in providing care to adolescents with complaints of dysmenorrhea. Conclusion: By reducing menstrual pain through relaxation techniques, adolescents can undergo learning and social activities more optimally. This contributes to improved quality of life, self-confidence, decreased anxiety or stress that often accompanies the menstrual cycle.